Re: some XFS questions

[Bernhard Erdmann <be@xxxxxxxxxxx>]

Eric Sandeen wrote:
[...]
> > 3. in xfs_dinode_core, there is di_projid.
> > What is this for?
>
> Irix has the concepts of user, group, and project, I believe.  Probably
> not used on Linux, but retained for on-disk compat.
[...]


http://techpubs.sgi.com/library/manuals/2000/007-2859-020/pdf/007-2859-020.pdf

states on p. 105:

"A project ID is similar to a group ID, with two major exceptions:

* The current project ID is associated within an entire array session, 
not an individual process.
* The project ID does not affect access permissions; it is intended 
mainly for accounting purposes, and is in fact reported in extended 
accounting information (see extacct(5) for details)."